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714,483 Views ā¢ Jul 5, 2021 ā¢ Click to toggle off description
0:00 General Intro
0:47 What do others say?
1:21 About wavelength and size
2:10 Interference in light
3:08 Electromagnetic waves and detection
5:25 Things that make you go Hmmm...
7:36 New experiment and setup
10:23 Calculation of single photon level (boring)
11:59 Result of the new experiment
12:41 Discussion of the result
16:29 About "shot noise"
17:16 EM field strength and probability of detection
19:18 So how big is it then?
20:02 Deleted scene
At 3:08 the Electric and Magnetic field components have been swapped accidentally.
Thanks to David Nadlinger, I was able to put my finger on what was experimentally wrong with the original experiment . The scientific explanation is actually very mathematical and way more complex: en.wikipedia.org/wiki/Degree_of_coherence. And although scientifically not very accurate, I tried to present a more intuitive description, based more on the classical description of EM waves rather than trying to explain the second order coherence function.
More about shot noise: en.wikipedia.org/wiki/Shot_noise
The "deleted scene" contains a 4 second clip of the movie "Crash Pad" (For preview see: Ā Ā Ā ā¢Ā CrashĀ PadĀ TrailerĀ 1Ā (2017)Ā |Ā Moviecli...Ā Ā ) It also contains a short audio clip of "New York City" by the Trammps (Ā Ā Ā ā¢Ā TheĀ TrammpsĀ -Ā (TheĀ NightĀ TheĀ LightsĀ W...Ā Ā ). I would also like to thank Vicky Pollard for explaining Quantization in more detail. These clips constitute copyrighted material, the use of which has not been specifically authorized by the copyright owner. The material serves as an educational and entertaining resource and only small portions of the original work are being used. This should constitute a 'fair use' of any such copyrighted material (referenced and provided for in section 107 of the US Copyright law).
If you wish to use any copyrighted material from this video for purposes of your own that go beyond 'fair use', you must obtain expressed permission from the copyright owner.17 U.S. Code Ā§ 107
Do you like what I do and want to support it? I'v recently started a patreon page: www.patreon.com/huygens_optics
Views : 714,483
Genre: Science & Technology
Date of upload: Jul 5, 2021 ^^
Rating : 4.925 (360/18,723 LTDR)
RYD date created : 2022-04-09T07:33:40.848826Z
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YouTube Comments - 3,596 Comments
Top Comments of this video!! :3
I've always kept in mind how one lecturer described it to me: light propagates like a wave and interacts like a particle. You can't go too far wrong with that. Glad to see the video comes to the same conclusion.
461 |
One of the most original, well spoken, informative and amazing videos in YouTube. 1 million likes by me!
84 |
I love your silliness. It feels like I'm watching a 1940s scientist instead of a post 2000s one. There's a more human touch on this channel than on a lot of others, while still having legitimate science and engineering.
99 |
The virtue of this video is not that it answered any questions, but that it intelligently and honestly raised some interesting ones, and showed how hard it is to do these kinds of experiments. Thanks for providing so much food for thought.
83 |
I love it! I never knew that coherent light would have additional assumptions compared to spontaneous emission in interference experiments. Maybe light really is a wave. The "duality" certainly seems less 50/50 and more like a wave with some extra features. Thanks so much for your videos.
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I've been searching over a year for a video like this, that actually performs the experiment and shows the results, not just an animation. Wonderful. Subscribed.
57 |
Wow. A logically consistent and scientifically consistent explanation of quantum mechanics. I've had trouble fully understanding the double slit phenomenon for years and now I suddenly think, "well duh, of course it works that way. It's obvious." You're an incredible teacher sir.
25 |
This is one of the best science videos on Youtube. I cannot imagine how much time, work and thinking have gone into making this amazing video. For me, this is a better way of communicating science to people than publishing in Nature or Science.
Thank you very much. Keep up the good work of educating people like me. Thanks.
182 |
āLetās not keep you in the dark any longerā ..very light on your puns there , really brightens my day.
38 |
Excellent video, this is the first time I've listened to such a clear explanation in such a short time of the seemingly paradoxical behavior of photons. The graphics and narrative are just what is needed to explain this topic in a super-efficient way. Thanks so much for sharing!
26 |
I love it when you tackle material that no one dares to tackle and present it in an accessible way
5 |
Wow, this is was a super concise and delightful presentation on something I've often seen ignored in modern POPSCI YouTube. You took a stab at explaining something I always imagined as black magic and I left with a greater intuition and understanding of something I don't even use day to day in my work. However it did make me think differently about EM in general, which is an amazing accomplishment for a such a short video.
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Hello!
Grad student working in quantum optics here. Great video!
The coherence length of a photon is the same coherence length as the beam. Single photon experiments can be done with kilometers of distance between the photons, given a sufficiently coherent laser. The explanation you have given is spot on.
Also, the attenuation method is not reliable to produce only single photons states. You're still in the right range, but the resulting beam will be "bunched", where you have a high probability of two-photon events. (think Bose-Einstein statistics) Either way, you're actually measuring the interference of the photons with your experiments, even if they are bunched up.
Generating single photon states is an area of ongoing research, but the main methods are 1) quantum dots, or 2) SPDC single photon heralding. Both of those require expensive equipment. The second method is totally attainable if you can get a single photon detector second hand from somewhere on the cheap. They tend to be very expensive.
Another interesting avenue to get single photons would be the SPDC part, where you could generate photon pairs from a single pump photon through interaction with a nonlinear cristal (like the ones found in green laser pointers). If you know about second harmonic generation, it's basically that process in reverse. Since you have photolithography equipment, you could DIY produce periodically poled materials that would even allow for colinear polarisation-entangled photon pairs to be generated.
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You made my day, i cracked my head on multiple books but none give that much i sight. You really gave beautiful insights and you will always be remembered for years for spreading this level of knowledge of optics
5 |
This is one of the best videos on YouTube on the subject, Iāve reference people to this video all the time. An incredible number of people have the misunderstanding that the EM field is quantized. The photon did not go through one slot or the other, the wavefront went through both. then it is just the probability of detection thereās no magic science about this.
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I've watched all your videos after discovering your channel two weeks a go. I'm addicted! Your explanations are superb!
43 |
Wow! Awesome to see the double-split actually demonstrated like this, whereas most discussions just illustrate it with graphics. Makes it seem even more mind blowing.
43 |
I agree! the cardboard shielding did provide that high-tech look required for the experiment š
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Thank you for explaining your double slit experiment and for correcting your original explanation.
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@Mireaze
2 years ago
A photon is exactly as big as it needs to be, unless you try measure it, then its exactly the wrong size
1.3K |